The Tcpdump Group git mirrors - libpcap/blob - tests/filtertest.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #ifndef lint
  23 static const char copyright[] _U_ =
  24     "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
  25 The Regents of the University of California.  All rights reserved.\n";
  26 #endif
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <pcap.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <stdarg.h>
  37 #include <unistd.h>
  38 #include <fcntl.h>
  39 #include <errno.h>
  40 #include <arpa/inet.h>
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43
  44 #ifndef HAVE___ATTRIBUTE__
  45 #define __attribute__(x)
  46 #endif
  47
  48 static char *program_name;
  49
  50 /* Forwards */
  51 static void usage(void) __attribute__((noreturn));
  52 static void error(const char *, ...)
  53     __attribute__((noreturn, format (printf, 1, 2)));
  54 static void warn(const char *, ...)
  55     __attribute__((format (printf, 1, 2)));
  56
  57 extern int optind;
  58 extern int opterr;
  59 extern char *optarg;
  60 #ifdef BDEBUG
  61 int dflag;
  62 #endif
  63
  64 /*
  65  * On Windows, we need to open the file in binary mode, so that
  66  * we get all the bytes specified by the size we get from "fstat()".
  67  * On UNIX, that's not necessary.  O_BINARY is defined on Windows;
  68  * we define it as 0 if it's not defined, so it does nothing.
  69  */
  70 #ifndef O_BINARY
  71 #define O_BINARY        0
  72 #endif
  73
  74 static char *
  75 read_infile(char *fname)
  76 {
  77         register int i, fd, cc;
  78         register char *cp;
  79         struct stat buf;
  80
  81         fd = open(fname, O_RDONLY|O_BINARY);
  82         if (fd < 0)
  83                 error("can't open %s: %s", fname, pcap_strerror(errno));
  84
  85         if (fstat(fd, &buf) < 0)
  86                 error("can't stat %s: %s", fname, pcap_strerror(errno));
  87
  88         cp = malloc((u_int)buf.st_size + 1);
  89         if (cp == NULL)
  90                 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
  91                         fname, pcap_strerror(errno));
  92         cc = read(fd, cp, (u_int)buf.st_size);
  93         if (cc < 0)
  94                 error("read %s: %s", fname, pcap_strerror(errno));
  95         if (cc != buf.st_size)
  96                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
  97
  98         close(fd);
  99         /* replace "# comment" with spaces */
 100         for (i = 0; i < cc; i++) {
 101                 if (cp[i] == '#')
 102                         while (i < cc && cp[i] != '\n')
 103                                 cp[i++] = ' ';
 104         }
 105         cp[cc] = '\0';
 106         return (cp);
 107 }
 108
 109 /* VARARGS */
 110 static void
 111 error(const char *fmt, ...)
 112 {
 113         va_list ap;
 114
 115         (void)fprintf(stderr, "%s: ", program_name);
 116         va_start(ap, fmt);
 117         (void)vfprintf(stderr, fmt, ap);
 118         va_end(ap);
 119         if (*fmt) {
 120                 fmt += strlen(fmt);
 121                 if (fmt[-1] != '\n')
 122                         (void)fputc('\n', stderr);
 123         }
 124         exit(1);
 125         /* NOTREACHED */
 126 }
 127
 128 /* VARARGS */
 129 static void
 130 warn(const char *fmt, ...)
 131 {
 132         va_list ap;
 133
 134         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 135         va_start(ap, fmt);
 136         (void)vfprintf(stderr, fmt, ap);
 137         va_end(ap);
 138         if (*fmt) {
 139                 fmt += strlen(fmt);
 140                 if (fmt[-1] != '\n')
 141                         (void)fputc('\n', stderr);
 142         }
 143 }
 144
 145 /*
 146  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 147  */
 148 static char *
 149 copy_argv(register char **argv)
 150 {
 151         register char **p;
 152         register u_int len = 0;
 153         char *buf;
 154         char *src, *dst;
 155
 156         p = argv;
 157         if (*p == 0)
 158                 return 0;
 159
 160         while (*p)
 161                 len += strlen(*p++) + 1;
 162
 163         buf = (char *)malloc(len);
 164         if (buf == NULL)
 165                 error("copy_argv: malloc");
 166
 167         p = argv;
 168         dst = buf;
 169         while ((src = *p++) != NULL) {
 170                 while ((*dst++ = *src++) != '\0')
 171                         ;
 172                 dst[-1] = ' ';
 173         }
 174         dst[-1] = '\0';
 175
 176         return buf;
 177 }
 178
 179 int
 180 main(int argc, char **argv)
 181 {
 182         char *cp;
 183         int op;
 184 #ifndef BDEBUG
 185         int dflag;
 186 #endif
 187         char *infile;
 188         int Oflag;
 189         long snaplen;
 190         char *p;
 191         int dlt;
 192         bpf_u_int32 netmask = PCAP_NETMASK_UNKNOWN;
 193         char *cmdbuf;
 194         pcap_t *pd;
 195         struct bpf_program fcode;
 196
 197 #ifdef WIN32
 198         if(wsockinit() != 0) return 1;
 199 #endif /* WIN32 */
 200
 201 #ifndef BDEBUG
 202         dflag = 1;
 203 #else
 204         /* if optimizer debugging is enabled, output DOT graph
 205          * `dflag=4' is equivalent to -dddd to follow -d/-dd/-ddd
 206      * convention in tcpdump command line
 207          */
 208         dflag = 4;
 209 #endif
 210         infile = NULL;
 211         Oflag = 1;
 212         snaplen = 68;
 213
 214         if ((cp = strrchr(argv[0], '/')) != NULL)
 215                 program_name = cp + 1;
 216         else
 217                 program_name = argv[0];
 218
 219         opterr = 0;
 220         while ((op = getopt(argc, argv, "dF:m:Os:")) != -1) {
 221                 switch (op) {
 222
 223                 case 'd':
 224                         ++dflag;
 225                         break;
 226
 227                 case 'F':
 228                         infile = optarg;
 229                         break;
 230
 231                 case 'O':
 232                         Oflag = 0;
 233                         break;
 234
 235                 case 'm': {
 236                         in_addr_t addr;
 237
 238                         addr = inet_addr(optarg);
 239                         if (addr == INADDR_NONE)
 240                                 error("invalid netmask %s", optarg);
 241                         netmask = addr;
 242                         break;
 243                 }
 244
 245                 case 's': {
 246                         char *end;
 247
 248                         snaplen = strtol(optarg, &end, 0);
 249                         if (optarg == end || *end != '\0'
 250                             || snaplen < 0 || snaplen > 65535)
 251                                 error("invalid snaplen %s", optarg);
 252                         else if (snaplen == 0)
 253                                 snaplen = 65535;
 254                         break;
 255                 }
 256
 257                 default:
 258                         usage();
 259                         /* NOTREACHED */
 260                 }
 261         }
 262
 263         if (optind >= argc) {
 264                 usage();
 265                 /* NOTREACHED */
 266         }
 267
 268         dlt = pcap_datalink_name_to_val(argv[optind]);
 269         if (dlt < 0) {
 270                 dlt = (int)strtol(argv[optind], &p, 10);
 271                 if (p == argv[optind] || *p != '\0')
 272                         error("invalid data link type %s", argv[optind]);
 273         }
 274
 275         if (infile)
 276                 cmdbuf = read_infile(infile);
 277         else
 278                 cmdbuf = copy_argv(&argv[optind+1]);
 279
 280         pd = pcap_open_dead(dlt, snaplen);
 281         if (pd == NULL)
 282                 error("Can't open fake pcap_t");
 283
 284         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
 285                 error("%s", pcap_geterr(pd));
 286
 287         if (!bpf_validate(fcode.bf_insns, fcode.bf_len))
 288                 warn("Filter doesn't pass validation");
 289
 290 #ifdef BDEBUG
 291         // replace line feed with space
 292         for (cp = cmdbuf; *cp != '\0'; ++cp) {
 293                 if (*cp == '\r' || *cp == '\n') {
 294                         *cp = ' ';
 295                 }
 296         }
 297         // only show machine code if BDEBUG defined, since dflag > 3
 298         printf("machine codes for filter: %s\n", cmdbuf);
 299 #endif
 300
 301         bpf_dump(&fcode, dflag);
 302         pcap_close(pd);
 303         exit(0);
 304 }
 305
 306 static void
 307 usage(void)
 308 {
 309         (void)fprintf(stderr, "%s, with %s\n", program_name,
 310             pcap_lib_version());
 311         (void)fprintf(stderr,
 312             "Usage: %s [-dO] [ -F file ] [ -m netmask] [ -s snaplen ] dlt [ expression ]\n",
 313             program_name);
 314         exit(1);
 315 }